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The Coopworth breed of sheep was developed by a team of scientists at Lincoln College (now Lincoln University) in Canterbury, New Zealand, to increase lambing percentages of Corridale, Merino, and Romney ewes when mated with Border Leicester rams. The progeny of those crosses were selectively cross-bred to produce sheep named Coopworth after Professor Ian Coop who headed the team in the early days. The New Zealand Coopworth Sheep Society controls the selection standards based on recorded performance standards.
The breed is easy to care for and makes up the second largest flock in New Zealand. It is also bred in Australia, parts of Europe, and the United States. The Coopworth is used for both meat and wool. An average fleece weighs 5 kg with a fibre diameter of about 37 micrometres being in the coarser range of wools with a staple length of between 125 and 200 mm. The live weight of an adult is about 55 kg.